Method of drying granular or powdered material by means of a fluid



Feb; 28, 1933,.;` l K. REICHE' 1,89997 METHOD 0F DRYING GRAHULAR 0R POWDERE'D MATERIAL BY IIEANKS OF A IL UIU rma sept. 22. 195o Patented I Feb. 1933 UNITED STATES `PATENT OFFICE;

KURT REICHE, F BEBLIN-HALENSEE, GERMANY, ASSIGNOB. T0 STETTIIEB CHAIOTTE- FABEIX ACTIEN-GESEILSCHAFT VORIALS DIDIER, 0F BEBLINWIIIEBSDOBF, GEB- HANY, A CORPORATION 0F GERMANY METHOD OF DRYIN G GBANULAB 0R MATERIAL BY MEANS 0F A. FLUID Applicationled September 22, 1930, Serial No.

-which iseconomical and elective in operation, andv with this object in view ny invention consists in first circulating the heating or cooling fluid alongside the outside of the container containing the material, and there-- after passing the said fluid through the said 'container and causing the same directly tov or other material having a zlgzag passage act on the material.

Another object of the 'improvements is to provide a method and an apparatus in which the hea-ting oricoolinv Huid is used for carrying the material torbe treated through the container, Aand with this object in view my invention consists in constructing the intakeend of a tubular container in the form of an injector, the fluid being admitted through the said injector athigh velocity and drawing the material into the container. 4

Other objects of the improvements will ap ear fromthe following description.

or the purpose of explaining the invention an apparatus suitable for putting the method into effect has been shown in the accompanying drawing in which the same reference -characters have been`used in all the views to indicate' corresponding parts. In said drawing,

Fig. 1 is a sectional. elevation showing the apparatus, and

Fig.2 is a sectional elevation taken on the line 2--2of Fig. 1.

In the example shown in the drawing the apparatus comprises a block 1 of brick-work arranged therein, the said passage comprising horizontal sections 2 alternately connected at opposite ends 4by semi-circular portions 21. The said passage is connected at its bottom with an intake passage 6 for the heating or cooling medium, and it is closed at its top en d as is shown at 5. Within the passage 2, 21 there 's a tubular container in the form ofa zigzag pipe 3,

483,444, and in Germany September B8, 1989.

the said tubular container being smaller in diameter thanvf the passage 2, 21, thus providing an annular passage surrounding the container. The pipe 3 is open at its top end and the delivery pipe 24 of a funnel is concentrically passed into the A'sama-so that an annular passage 25 is provided between the pipe 24 and the intake end of the pipe 3. At its bottom end 7 the pipe 3 opens into a container 8 connected by a pipe 9 with a fan or blower 10 and a delivery pipe 11. The pipes 7 and 9 are connected to the top of the container 8 and between the same a partition 26 is provided which extends from lthe top of the container to a point spaced from the bottom thereof.

When using the apparatus for drying loose material the fan 10 is started and hot gas such as air, waste gas or the like is admitted through the passage 6, and loose material to be dried is supplied through the funnel 4 and the delivery pipe 24 thereof. By the suction of the fan the hot gas is drawn through draws the loose material from the pipe 24 and.

int. the pipe 3. Within the pipe the gas further heats the loose material by direct contact and its velocity is such that it carries the loose material through the pipe 3. ,Finally it carries the dried material through the pipe' 7 into the container 8, the loose material being deposited therein by reason of the sudden'change of the direction of the flow thereof. The heating gas is delivered through the pipe 11 and it may be conducted to a heating system wherev it is again heated and dried for being again entered into the circuit. The materials carried by the gas through the pipe 3 are directly heated and dried within the pipe and further they are heated and vdried by the hot gas flowing around the pipe. rlhe current of gas has its highest temperature y the iiow of the mixture of gas and loose material has been indicated by arrows shown in dotted lines.

Where the apparatus is used for cooling purposes cold gas is admitted through the passage 6. The function of the cooling medium will be understood without further description.

By my improved apparatus granular or powdered material such as coke, coal, gravel,`

sand and the like may be dried, glowed,

cooled or otherwise treated, and by causing the gas to act rst on the outside of the pipe and thereafter directly on the material, the heating or cooling effect is high and economical. The heating and cooling effect is par' ticularly high in case of powdered or finally disintegrated loose material which floats Within the current of gas.

In the figures I have shown an apparatus in Which/the passages for the gas and the material are arranged in zigzag, but I wish it to be understood that I do not limit myself to this feature. In somev cases I may use rectilinearpassages, and where curved passages are used care should be taken that the curved portions thereof such as the portions 21 are curved along largeradii for reducing the resistance opposed tothe flow ofthe gas and the material. In this respect particularly good results are obtained when providing helical passagesT I claim:

The herein ldescribed method of treating granular or pulverized material which consists in passing said material over a confined path, forcing a gas first over said path in external relation thereto and in indirect relation to the material therein, then passing said gas interiorly into said path into direct con- 'tact with said material, and increasing the velocity of said gas coincidentally with its passage into said path to such an extent that it carries the material therethrough' in a suspended state.

In testimony whereof I hereunto aiix my signature.

KURT REICI-IE. 

